First program in java

Java first program and explanation

public class Hello

• class is a keyword, which is identifier used to declare a new class (Hello is a new class).

public static void main(String[] args)

• This is main method of the class.
• It is suggests that program will begin executing.
• All of the java program begin their execution by calling main().
• Public keyword is an access specifier which allows to control the visibility of a java program.
• Here the main () must be declared public.
• static allows main () to be called without declaring the objects.
• There is only one parameter in main () i.e. String args[], basically it is an array of instances of the string class.

System.out.println("Hello World!)

• Hello World! - this line used to display the string.
• The println() is a method which is used to take the cursor on to a new line.